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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 22 — Aug. 1, 2012
  • pp: 5464–5476

Temperature measurements in a rapid compression machine using mid-infrared H2O absorption spectroscopy near 7.6 μm

Mruthunjaya Uddi, Apurba Kumar Das, and Chih-Jen Sung  »View Author Affiliations


Applied Optics, Vol. 51, Issue 22, pp. 5464-5476 (2012)
http://dx.doi.org/10.1364/AO.51.005464


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Abstract

A method for measuring the temporal temperature and number density in a rapid compression machine (RCM) using quantum cascade laser absorption spectroscopy near 7.6 μm is developed and presented in this paper. The ratios of H2O absorption peaks at 1316.55cm1 and 1316.97cm1 are used for these measurements. In order to isolate the effects of chemical reactions, an inert mixture of argon with 2.87% water vapor is used for the present investigation. The end of compression pressures and temperatures in the RCM measurements are PC=10, 15, and 20 bar in the range of TC=1000 to 1200 K. The measured temperature history is compared with that calculated based on the adiabatic core assumption and is found to be within ±5K. The measured temporal number density of H2O to an accuracy of 1%, using the absolute absorption of the two rovibrational lines, show that the mixture is highly uniform in temperature. A six-pass, 5.08 cm Herriott cell is used to calibrate the line strengths in air and broadening in an Ar bath gas.

© 2012 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(300.0300) Spectroscopy : Spectroscopy

ToC Category:
Spectroscopy

History
Original Manuscript: March 13, 2012
Revised Manuscript: June 18, 2012
Manuscript Accepted: June 22, 2012
Published: July 27, 2012

Citation
Mruthunjaya Uddi, Apurba Kumar Das, and Chih-Jen Sung, "Temperature measurements in a rapid compression machine using mid-infrared H2O absorption spectroscopy near 7.6 μm," Appl. Opt. 51, 5464-5476 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-22-5464

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